Hi,
Thanks for posting in Q&A platform.
Before we go further, may I know why do you want to remain DNS role on this server? If this server was a standalone DNS server, and there are another 2 DC&DNS servers in your environment, updates in DNS servers will be synced automatically in another 2 DCs and will not be synced in this server. The zone transfer request must be initiated on this server to request zone replication from primary DNS server. Based on my understanding, you do not need keep DNS role on this server since there are still 2 DCs in your environment is enough.
Best Regards,
Sunny
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